Easily set for 2 or 3 minute workout period. Set between round length to 30 seconds or 1 minute with the flip of a switch. Can be used as a round timer, or to incorporate interval workouts in any training. Capped lighting system visually indicates where you are at all times. (Green = workout, Yellow = 30 seconds left in round, Red = between rounds.). Rest periods between rounds can be set for 15, 30, 45 or 60 seconds. Interval period during rounds can be set for 0, 15, 30, 45 or 60 seconds. Multi-cadence beeps. Extra loud round bell can be heard in any gym - complete with 30 second end of round warning whistle. Bell indicates round beginning and ending beep indicates interval. This timer can be used for boxing, kickboxing, martial arts, fitness workout and much more. 15 x 10 x 12 inches.